ISIS militants have executed 13 teenage boys for watching the Asian Cup football match between Iraq and Jordan last week. The young football fans had been caught watching the game on television in the Iraqi city of Mosul, which is controlled by the Islamic State.

According to anti-ISIS activist group Raqqa is Being Slaughtered Silently, the teenagers were rounded up and publicly executed by a firing squad using machine guns. 'The bodies remained lying in the open and their parents were unable to withdraw them for fear of murder by terrorist organisation,' the group writes on their website.

Raqqa is Being Slaughtered Silently is a small activist collective which secretly documents the shocking violence and oppression ISIS has brought to their home city, Syria.